TPS54388-Q1_15 Datasheet, PDF (28/40 Pages) Texas Instruments – TPS54388-Q1 2.95-V to 6-V Input, 3-A Output, 2-MHz, Synchronous Step-Down SWIFT™ Switcher

TPS54388-Q1
SLVSAF1D – OCTOBER 2010 – REVISED APRIL 2015
T_A(max) is maximum ambient temperature (°C).
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There are additional power losses in the regulator circuit due to the inductor ac and dc losses and trace
resistance that impact the overall efficiency of the regulator.
9.2.3 Application Performance Plots
100
90
80
V_(VIN) = 3.3 V
70
V_(VIN) = 5 V
60
50
40
30
20
10
00
0.5
1
1.5
2
2.5
3
Output Current (A)
V_O = 1.8 V
Figure 35. Efficiency vs Load Current
100
1.8 V
2.5 V
95
90
85
80
1.05 V
1.2 V
1.5 V
75
70
65
60
55
50
0
0.5
V_(VIN) = 3.3 V
1
1.5
2
Output Current (A)
f_(SW) = 1 MHz
2.5
3
T_A = 25°C
Figure 37. Efficiency vs Load Current
V_(VIN) = 2 V/div
100
90
80
70
60
V_(VIN) = 3.3 V
V_(VIN) = 5 V
50
40
30
20
10
0
0.001
0.01
0.1
1
10
Output Current (A)
V_O = 1.8 V
Figure 36. Efficiency vs Load Current
100
95
90
85
2.5 V
1.8 V
1.5 V _{1.2 V}
80
3.3 V
1.05V
75
70
65
60
55
50
0
0.5
V_(VIN) = 5 V
1
1.5
2
Output Current (A)
f_(SW) = 1 MHz
2.5
3
T_A = 25°C
Figure 38. Efficiency vs Load Current
V_(VIN) = 2 V/div
EN = 1 V/div
EN = 1 V/div
SS/TR = 1 V/div
SS/TR = 1 V/div
V_O = 1 V/div
Time = 5 ms/div
Figure 39. Power Up V_O, V_(VIN)
V_O = 1 V/div
Time = 500 ms/div
Figure 40. Power Down V_O, V_(VIN)
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